AQA AS Level Biology Paper 2, June 2019
Every question from AQA AS Level Biology Paper 2, June 2019 (7401): 9 questions, 75 marks, each with its mark scheme and topic.
- Question 1 10 marks
Describe the role of enzymes in protein digestion, interpret data on rabbit protein absorption across different dietary percentages, and suggest how eating caecal droppings aids protein absorption.
Biology · Practical skills · 3.3 Organisms exchange substances with their environment · Data analysis
- Question 2 6 marks
Describe and explain the effect of carbon dioxide concentration on oxyhaemoglobin dissociation, interpret a seal myoglobin dissociation curve, and calculate maximum dive time based on seal blood oxygen capacity.
Biology · 3.3 Organisms exchange substances with their environment
- Question 3 5 marks
Name Watson and Crick, identify DNA polymerase as the enzyme for replication, and explain the roles of single-stranded DNA fragments as templates and DNA nucleotides in semi-conservative replication.
Biology · 3.1 Biological molecules
- Question 4 10 marks
Describe and explain the role of antibodies in stimulating phagocytosis, analyze antibody concentration data following meningitis vaccine injections, calculate the duration above protective levels for a specific mouse, evaluate the effectiveness of the injections, and suggest a practical method to test for memory B cells.
Biology · Practical skills · 3.2 Cells · Data analysis
- Question 5 10 marks
Investigate water movement in celery stalks involving transpiration rate measurements, transport mechanisms in xylem vessels, safe scalpel use, and statistical processing of distance data.
Biology · Practical skills · Experimental design · Data analysis · 3.3 Organisms exchange substances with their environment
- Question 6 9 marks
Describe and explain aseptic techniques, differences between mitosis and meiosis, chromatid numbers, and conclusions on chromosome movement from spore tube data in Neurospora.
Biology · Practical skills · Required Practicals · 3.4 Genetic information, variation and relationships between organisms · Experimental design · AS practicals (1–6)
- Question 7 9 marks
Evaluate whether an investigation on fish populations in tanks with different artificial selection regimes supports the use of mesh nets in sea fishing.
Biology · Practical skills · 3.4 Genetic information, variation and relationships between organisms · Experimental design · Data analysis
- Question 8 6 marks
Analyze genetic diversity in bird species by comparing DNA base sequences, calculating percentage differences, matching histograms to taxonomic groups, and choosing an appropriate statistical test.
Biology · Practical skills · 3.4 Genetic information, variation and relationships between organisms · Data analysis
- Question 9 10 marks
Describe the roles of iron ions, sodium ions, and phosphate ions in cells, and explain how membrane structure affects the movement of substances across cell membranes.
Biology · 3.1 Biological molecules · 3.2 Cells